Running REPLs

As of 0.0-2665 REPLs have changed significantly enough that many
existing third party REPLs and REPL launchers no longer work. While they
are likely to be updated in the near future the following demonstrates
how to run REPLs directly without using anything more than Leiningen
itself.

All that is required is to make a REPL runner .clj file. For example
if your cljsbuild entry looks like the following: